My soul for sale (building advice needed)

I cannot believe I am having to consider 1960/70/80's developer houses to live in.
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However
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We have this one local, that is a good price, on a good plot. A total do-upper. We would need an extension - like the neighbour to the right, but full length.
The extension would be two bedrooms and a loo / washing & drying room, one doorway from existing bungalow, one window each end and one smaller window in middle.
I estimate costs at £800-900m2, assuming I can do lots...Am I far wrong?

£800-900m2 should be OK if you can do a bit yourself. The tricky bit will be getting trades to the other bits IME, I've ended up doing a lot more myself than planned so it is even cheaper but slower. Site looks easy to access and work on. Are you keeping structural work to a minimum? ie punching through for doors rather than removing whole walls.

trail_rat - I would take an ex-council house over these if it comes up. Sadly, those in the ex-council houses round here know they are onto a good thing and they just never come up.
More the (lack) of quality build and wee gardens than anything.
I (hope) it is not snobbery. It isn't intended as such.
As Rob says, we have come from lovely old terrace house and nice garden; to huuge house and huuuge garden with *the* best view in Scotland.
Work and practicalities and personal choice have dictated a chuffing expensive and snobby part of Scotland to live in - and house prices reflect it. 10 miles down the road, this house would be £60k less than it is.

The idea was:
Me - site prep etc
Me: Structural work (minimum - one doorway, I can do that).
Footings: get someone in to lay upto and including a flat slab.
Me: Lay thin-bed, solid wall block exterior and interior walls and install windows.
Chippy / Roofer: Do the roof as the detailing could be a faff/possibly flat roof that I could construct.
Plumber and sparky to install a new boiler and wire etc.
Me to board out ceilings etc
Plasterer to skim inside.
Me to clad / render outside.
Chippy for doors / skirtings.

Check the roof pitch-line, neighbours looks shallow, don't want future issues with roof.
Also worth considering timber frame, may result in thinner walls for better insulation and get frame up roof on faster?
Where are the drains/services, may add costs, check window overlooking neighbours, first consider planning/ BR implications, size extension verses house area and planning rights.
Good luck.

I think the windows down the side will be a) a planning issue (overlooking) and b) Blg Reg's to do with fire risk/spread near to a boundaryline.
Next doors extenion does look narrow, maybe due to roof line, so check dimmensions, maybe need a sketch plan to consider...I appreciate Matt was just asking about £/sqm, we'll just come up with more questions to consder....;)

matt - you're not a snob. trail rat appears more of a forced reverse snob than anything. As for 'it's the people inside' - yeah, right. That's the sort of thinking that permits the construction industry to keep on throwing up gash buildings that don't perform very well or support the wellbeing of the occupants.

There are no others on the street that have 'upped' the roof - no precedent, so planning would be very unlikely to say yes.
Next doors extension is narrow, but is that way as that is narrower plot (they seem to have ~10ft to boundary so ~6 feet extension is all they would have been allowed)
'Ours' has ~18 feet, so a ~12feet wide should be allowed.
We would not need windows in side, other than high level or even roof light for loo/laundry. Bedroom windows would be front & back.

built an 86m2 extension on our bungalow 5 years ago did most of the work myself, no bathrooms or kitchens though, £60000.

I am erring towards it isn't worth the financial outlay. My dread is that an extension would take the house up to the cost of an existing 4 bed, without the hassle...

[prepares to be flamed]Have you thought about an architect[flame proof pants now on]

If this is a long term proposition for you then making the most of what your going to do is key. If I was investing a decent chunk of money I'd want to know I was making the most of the space, light and all the rest.

A 12 ft wide addition with a flat roof will look crap; 12 ft wide will mean that the roof is too shallow for drainage if built like the neighbors. So, consider a gabled roof over the addition that intersects at 90 degrees to your current ridgeline. It will look much better IMO.